Hello @Dinesh Choudhary
Azure DevOps organization deletion is intentionally a soft-delete process. After you delete an organization, it remains disabled and recoverable for 28 days before Azure DevOps permanently deletes the organization and its data. In rare cases, backend deletion can take up to 70 days because of retries across multiple data sources.
The current Azure DevOps UI doesn't offer a documented self-service option to bypass this retention period and immediately hard-delete an organization.
If the pending organizations are preventing you from creating another organization because of your quota, I recommend opening an Azure DevOps support request and explaining that the soft-deleted organizations are consuming your organization quota. Support can confirm whether they can adjust the quota or whether any backend action is available for your account.
Otherwise, you'll need to allow the normal deletion process to complete.
Reference: Microsoft – Delete an Azure DevOps organization
Also, don't restore and delete the organizations again. That just restarts the deletion process instead of speeding it up.
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